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Browser Extensions · head to head

SimilarWeb vs Userscripts

SimilarWeb logo

SimilarWeb

Browser Extensions

Website traffic and competitive analysis

From
Free
Rated
-
Full reviewWebsite
Userscripts logo

Userscripts

Browser Extensions

Open-source userscript manager for Safari on Mac and iOS

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: SimilarWeb browser extension data accuracy is lower than full platform; Userscripts safari cannot let extensions bypass a site's Content Security Policy, so strict sites produce "Refused to execute a script" errors that the @inject-into workaround does not always fix.
  • They diverge on capability: SimilarWeb covers Traffic analytics, Userscripts covers Built-in script editor.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which SimilarWeb and Userscripts actually diverge.

Attributes where SimilarWeb and Userscripts differ
AttributeSimilarWebUserscripts
Pricing modelfreemiumopen-source
PlatformsWeb, Browser ExtensionSafari, macOS, iOS
Founded2007Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Browser Extensions).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in SimilarWeb

  • Traffic analytics
  • Audience insights
  • Competitor research
  • Industry analysis
  • Chrome support
  • Firefox support
  • Edge support

Only in Userscripts

  • Built-in script editor
  • Standard metadata support
  • GM API
  • Remote script updating
  • iCloud sync
  • Per-page popup

What people use each for

The jobs each tool is most often brought in to do.

SimilarWeb

  • Analyzing competitor advertising across display, search, socialnot Userscripts
  • Understanding traffic loss to search and AI recommendationsnot Userscripts
  • Tracking brand visibility across ChatGPT and AI chatbotsnot Userscripts
  • Optimizing Amazon product placement with marketplace analyticsnot Userscripts
  • Identifying high-intent prospects at optimal buying momentsnot Userscripts

Userscripts

  • Running userscripts on Safari without paying for Tampermonkeynot SimilarWeb
  • Running userscripts on an iPhone or iPadnot SimilarWeb
  • Writing scripts on a Mac and syncing them to iOSnot SimilarWeb
  • Blocking or restyling site elements Safari content blockers cannot reachnot SimilarWeb
  • Keeping a script library under an open-source licencenot SimilarWeb

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

SimilarWeb

  • Browser extension data accuracy is lower than full platform
  • Full platform pricing is not transparent and requires quote-based inquiry

Userscripts

  • Safari cannot let extensions bypass a site's Content Security Policy, so strict sites produce "Refused to execute a script" errors that the @inject-into workaround does not always fix.
  • Apple only. There is no Chrome, Firefox or Edge build, so it cannot be a cross-browser answer.
  • iCloud sync is documented as having delays, which is awkward when editing the same script on two devices.
  • Requires macOS 12 and Safari 14.1, or iOS 15.1, so older Apple hardware is excluded.
  • GPL v3 means a commercial licence is required for non-open-source use, which matters if you are embedding rather than just using it.

Pricing, plan by plan

SimilarWeb

Free
  • FreeFree
    • Traffic overview
    • Engagement metrics
    • Similar sites

Userscripts

Free
  • FreeFree
    • Full functionality
    • GPL v3 licensed
    • macOS, iOS and iPadOS

Which should you pick?

Choose SimilarWeb if

  • You need traffic analytics.
  • You want to start without paying.
  • You work on Web, Browser Extension.
  • You also want audience insights.
SimilarWeb review

Choose Userscripts if

  • You need built-in script editor.
  • You want to start without paying.
  • You work on Safari, macOS, iOS.
  • You also want standard metadata support.
Userscripts review

Questions people ask

Is SimilarWeb or Userscripts better?
Neither clearly leads. SimilarWeb starts at Free and Userscripts at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, SimilarWeb or Userscripts?
SimilarWeb starts at Free and Userscripts at Free.
Does SimilarWeb or Userscripts run on more platforms?
SimilarWeb runs on Web, Browser Extension. Userscripts runs on Safari, macOS, iOS.
Can I use SimilarWeb for free?
Both have a free tier, so you can try either at no cost before committing.
What is SimilarWeb best used for?
SimilarWeb is most often used for analyzing competitor advertising across display, search, social, understanding traffic loss to search and ai recommendations, tracking brand visibility across chatgpt and ai chatbots, optimizing amazon product placement with marketplace analytics. Of those, analyzing competitor advertising across display, search, social and understanding traffic loss to search and ai recommendations are not what Userscripts is typically brought in for.
What can SimilarWeb do that Userscripts cannot?
SimilarWeb covers Traffic analytics, Audience insights, Competitor research, Industry analysis. Userscripts covers Built-in script editor, Standard metadata support, GM API, Remote script updating.

Answered from the vendors’ own pages

SimilarWeb: How much does Similarweb cost?

Similarweb does not publish pricing. Custom packages are available for businesses and enterprises. Self-service options are available for entrepreneurs and small teams. Customers must start a free trial or contact sales to receive a quote.

Source
Userscripts: Is Userscripts for Safari free?

Yes, free on the App Store and licensed under GPL v3. A commercial licence is required for use in something that is not itself open source.

Source
SimilarWeb: Does Similarweb offer a free trial?

Yes. Similarweb offers free trials for its various products. Users can start a free trial through their registration page or contact support to switch between different product trials.

Source
Userscripts: Does it work on iPhone?

Yes, on iOS and iPadOS 15.1 or later, which makes it one of the few ways to run userscripts on an iPhone.

Source
SimilarWeb: What products does Similarweb offer?

Similarweb offers the Competitive Intelligence Suite, Strategic SEO Suite, Ads Intelligence Suite, Gen AI Intelligence Suite, AI Studio with natural language queries, custom data feeds, API access, and managed services with custom dashboards.

Source
Userscripts: Why do I get "Refused to execute a script" errors?

Safari does not let extensions bypass a site's Content Security Policy the way other browsers do. The documented workaround is changing the script's @inject-into setting, though it does not resolve every case.

Source
Userscripts: Do my scripts sync between Mac and iPhone?

Yes, over iCloud, though the project notes the sync can be delayed rather than immediate.

Source
Userscripts: What are the system requirements?

macOS 12 or later with Safari 14.1 or later, or iOS and iPadOS 15.1 or later.

Source
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